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A manica (Latin: manica, "sleeve") was a type of iron or bronze arm guard, with curved and overlapping metal segments or plates, fastened to leather straps, worn by Roman gladiators called crupellarii, and later by soldiers.
Origins and early use
As early as Achaemenid times, there were references to "cheires" which consisted of hoops of metal that would be worn on the rein arm of a cavalryman. Hooped armour became extremely popular in the Saka, Parthian, and Kushan kingdoms and was used on both arms and legs. They can be seen at Khalchayan and on many pieces of Parthian artwork. In addition, two pieces were excavated at Taxila, dating to the 1st Century.
Roman troops fought crupellarii in the revolt of Florus and Sacrovir of 21 AD. From Trajan's Dacian Wars come the only representational evidence for the use of the manica, and we do not know if its use in that campaign was widespread or rare. Manicae (along with metal greaves) are attested as a supplement to metal body armour on several reliefs depicting that campaign, including the Tropaeum Traiani at Adamclisi and Trajan's Column.
These extra pieces of armour may have been used as a protection against the Dacian falcēs, which were two-handed weapons which could hit with great force. Trajan's column in Rome seems to suggest that the lorica segmentata and the manica were only issued to Roman-born legionaries and not to auxiliaries. However, the Tropaeum Traiani, which is considered a better guide to the reality of field equipment, portrays Roman legionaries and heavy infantry auxiliaries equipped in the same fashion—both wearing scale body armour with manica arm guards.
Distribution and later use
Finds identified as manicae have come from Newstead, Carnuntum, Richborough, Corbridge, Eining on the Danube frontier, Leon, Carlisle, and Ulpia Traiana Sarmizegetusa. These suggest that the manica was in use by the Roman military during the 1st century AD, independent from the Dacian wars. The sculpture at Alba Julia provides evidence of the manica in use in the 2nd and 3rd centuries AD by the military. Ammianus describes Roman cavalry (probably cataphracts) on parade in 350 AD as "Laminarum circuli tenues apti corporis flexibus ambiebant per omnia membra diducti." (Thin circles of iron plates, fitted to the curves of their bodies, completely covered their limbs). Around 400 AD, manicae are represented on the Column of Arcadius and in the Notitia Dignitatum.
Construction and use
Bishop lists likely components as one shoulder plate, about 35 metal (ferrous or copper alloy) strips, 90-120 leathering rivets, 3 or 4 internal leathers, and one padded lining. The lining may have been a separate component, in order to avoid it being torn by the articulated metal plates. The metal strips were about 25 to 30 mm wide and 0.35 to 0.5 mm in thickness; they were longer at the top of the arm. Each strip had holes at its lower edge, through which flat-headed copper alloy rivets passed from the inside to hold the leather straps in place. It also had a hole punched at each end, which did not have a rivet and presumably served as an attachment point for an organic fastening. The lower few plates were in some cases riveted together, rather than articulated on leather. One depiction appears to show a manica terminating in a hand shape.
The usual arm position depicted for Roman swordsmen is with the upper arm vertical and close to the torso, the forearm extended horizontally with the thumb uppermost. The plates were probably not long enough to cover the whole circumference of the arm, but would have extended from the upper arm down to the thumb, leaving an unprotected area at the back. The plates overlapped upwards, directing any blow to the inside of the elbow which had a particularly dense coverage of multiple plates.
- Article by James Yates, M.A., F.R.S., on p. 729 of William Smith, D.C.L., LL.D.:A Dictionary of Greek and Roman Antiquities, John Murray, London, 1875. 
- The Manica. Roman Military Research Society. http://www.romanarmy.net/manica.htm accessed 18 August 2009, quoting Tacitus, Annales, III 43
- Details of a manica built by a member of the modern Legion XX
- The Manica. Roman Military Research Society. http://www.romanarmy.net/manica.htm accessed 18 August 2009
- Legion XXIV's study of the hoard
- National Museums Scotland catalogue entry
- Ammianus Marcellinus. Res Gestae. XVI:VIII. Constantius et Julianus. http://www.loebclassics.com/view/amminanus_marcellinus-history/1939/pb_LCL300.247.xml accessed 30 May 2015.
- Lorica Segmentata - (Vol. I.) - A Handbook of Articulated Roman Plate Armour. Journal of Roman Military Equipment Studies, Monograph 1, 2002. ISBN 0-9539848-4-2, ISSN 1477-8645. M. C. Bishop. Chapter 8. Other segmental armour. pages 68–72. http://www.scribd.com/doc/17405191/Lorica-Segmentata-Vol-I-Handbook-of-Articulated-Roman-Plate-Armour
- Tacitus, Annales, III 43
- Curle, James. A Roman Frontier Post and its People.
- Shadrake, Susanna. The World of the Gladiator.